A review on coatings deposited by extreme high-speed laser cladding: processes, materials, and properties

In recent years, the industry has required critical parts with excellent high-temperature resistance, wear resis-tance, corrosion resistance, and other properties. Preparing high-performance coatings on part surfaces is considered an efficient and economical method. As a new surface treatment technology, extreme high-speed laser cladding (EHLA) has attracted increasing attention owing to its high cladding efficiency and rapid cooling rate. EHLA can maintain good metallurgical bonding between coating and substrate at low heat input. It can signif-icantly promote the refinement of microstructure and uniform composition distribution. In addition, optimiza-tion of EHLA parameters allows for control of coating thickness and inhibition of defect formation. This paper introduces the research progress of extreme high-speed laser cladding technology in detail from cladding process optimization, process simulations, material systems, and defect types. The setting of process parameters, the factors affecting the EHLA coating performance, and the formation mechanism of defects are also summarized.

Automated summary

In recent years, there has been a demand for critical parts in the industry that possess excellent high-temperature resistance, wear resistance, corrosion resistance, and other properties. Extreme high-speed laser cladding (EHLA) has emerged as a new surface treatment technology that efficiently and economically prepares high-performance coatings on part surfaces. EHLA enables good metallurgical bonding between coating and substrate at low heat input and promotes microstructure refinement and uniform composition distribution. This paper provides a detailed overview of the research progress in EHLA technology, covering cladding process optimization, process simulations, material systems, and defect types, as well as the setting of process parameters, factors affecting coating performance, and defect formation mechanism.